EARTHSC 2GG3 Lecture 29: Lecture 29 Extratropical Cyclones and Nor'Easters(2)

• School: Mohawk College
• Department: Earth Sciences
• Course: EARTHSC 2GG3
• Professor: John Maclachlan

Document Summary

North a(cid:373)eri(cid:272)a. it"s (cid:272)alled (cid:862)(cid:374)or"easter(cid:863) (cid:271)ecause the winds over coastal areas blow from a northeasterly direction: nor"easters t(cid:455)pi(cid:272)all(cid:455) (cid:271)e(cid:272)o(cid:373)e (cid:373)ost i(cid:374)te(cid:374)se (cid:374)ear ne(cid:449) e(cid:374)gla(cid:374)d a(cid:374)d the. Canadian maritime provinces: extratropical cyclones and tropical cyclones: comparison. The top schematics show horizontal maps of the surface temperature, pressure, and wind fields associated with a tropical cyclone (left) and an extratropical cyclone (right) (blue colour - 15c, blue green - 20c, green - 25 c). Dashed lines indicate surface wind speeds : 34 kt =39 kph, 64 kt =117 kph, and 96 kt=174 kph. The bottom schematics show vertical maps of the pressure surfaces, temperature anomalies, and circulation at the land surface and tropopause. Decrease in frequency: extratropical cyclones: areas at risk, the east coast of north america provides an ideal breeding ground for (cid:374)or"easters: During winter, the polar jet stream transports cold arctic air southward across the plains of canada and the u. s. , and eastward toward the atlantic ocean.